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<h1>Hibernate
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<p><a name="Hibernate-Samplepersistence.xml"></a></p>
<h1>Sample persistence.xml</h1>
<p>For a unit called "movie-unit" using two datasources called "movieDatabase"
and "movieDatabaseUnmanaged" the following persistence.xml would work.</p>
<pre><code>&lt;persistence version="1.0"
xmlns="http://java.sun.com/xml/ns/persistence"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/persistence
http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd"&gt;
&lt;persistence-unit name="movie-unit"&gt;
&lt;provider&gt;org.hibernate.ejb.HibernatePersistence&lt;/provider&gt;
&lt;jta-data-source&gt;movieDatabase&lt;/jta-data-source&gt;
&lt;non-jta-data-source&gt;movieDatabaseUnmanaged&lt;/non-jta-data-source&gt;
&lt;properties&gt;
&lt;property name="hibernate.hbm2ddl.auto" value="create-drop"/&gt;
&lt;property name="hibernate.transaction.manager_lookup_class"
value="org.apache.openejb.hibernate.TransactionManagerLookup"/&gt;
&lt;/properties&gt;
&lt;/persistence-unit&gt;
&lt;/persistence&gt;
</code></pre>
<p>Note that as of OpenEJB 3.1 you do not need to set the
<code>hibernate.transaction.manager_lookup_class</code> as it will be set for you
automatically and will overwrite any "org.hibernate.transaction." strategy
class already set while leaving any custom strategy class you may have
implemented untouched.</p>
<p>The result is that you can leave your
<code>hibernate.transaction.manager_lookup_class</code> property configured to your
production environment and OpenEJB will update it just for the scope
testing. On the other hand if you have implemented a custom
<code>org.hibernate.transaction.TransactionManagerLookup</code> strategy it will
always be used and never replaced by OpenEJB.</p>
<p>Note that if you need more functionality in this area we are always happy
to add it.</p>
<h1>Not using OpenEJB in production?</h1>
<p>If you're using OpenEJB 3.0 which does not support the dynamic switching of
the <code>hibernate.transaction.manager_lookup_class</code> this is one way to achieve
it.</p>
<p>A custom implementation of Hibernate's <em>TransactionManagerLookup</em> strategy
like the following will do the trick. This
"DynamicTransactionManagerLookup" class can be packed in your jar and
deployed with your app.</p>
<pre><code>import org.hibernate.HibernateException;
import org.hibernate.transaction.TransactionManagerLookup;
import javax.transaction.TransactionManager;
import java.util.Properties;
public class DynamicTransactionManagerLookup implements TransactionManagerLookup {
private TransactionManagerLookup impl;
public DynamicTransactionManagerLookup() {
String[] strategies = {
"org.apache.openejb.hibernate.TransactionManagerLookup",
"org.hibernate.transaction.JBossTransactionManagerLookup"
};
for (String className : strategies) {
try {
Class&lt;?&gt; clazz = this.getClass().getClassLoader().loadClass(className);
impl = (TransactionManagerLookup) clazz.newInstance();
break;
} catch (Exception e) {
}
}
if (impl == null) throw new IllegalStateException("No TransactionManagerLookup available");
}
public TransactionManager getTransactionManager(Properties properties) throws HibernateException {
return impl.getTransactionManager(properties);
}
public String getUserTransactionName() {
return impl.getUserTransactionName();
}
}
</code></pre>
<p>Then set the Hibernate specific configuration property
<em>hibernate.transaction.manager_lookup_class</em> to the name of the factory
that you just created.</p>
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